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A process for eliminating recrystallization of single crystal superalloy castings

A technology of superalloys and process methods, which is applied in the field of superalloys and can solve problems such as the generation of transverse grain boundaries and damage to high-temperature creep properties

Active Publication Date: 2020-06-16
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the actual solidification process, strain-induced recrystallization occurs due to casting stress, which in turn produces transverse grain boundaries, which impairs its high-temperature creep properties.

Method used

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  • A process for eliminating recrystallization of single crystal superalloy castings
  • A process for eliminating recrystallization of single crystal superalloy castings

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The auxiliary process part 6 and the single crystal casting 7 are integrally injection molded by the mold; the injection molding pressure is 0.5 MPa, the injection time is 20 seconds, and the pressure holding time is 30 seconds.

[0022] The crystal selector 4 is a spiral crystal selector, and the height of the crystal section 4-1 part is 10mm, and the diameter is 10mm; the crystal selection section 4-2 is spiral, and its diameter is 2mm; the thickness of the transition section 4-3 is 5mm;

[0023] The cross-sectional shape of the seeding bar 5 is circular, the diameter is 2mm, and the length of the seeding bar 5 is 20mm;

[0024] The cross-sectional shape of the process auxiliary part 6 is a square, and the side length of the square is 3 mm; the length of the process auxiliary part 6 is 10 mm;

[0025] The single crystal casting 7 mold shell is prepared by alumina coating and alumina shell material; the mold shell is dewaxed by steam dewaxing, the dewaxing pressure is...

Embodiment 2

[0027] The auxiliary process part 6 and the single crystal casting 7 are integrally injection molded by the mold; the injection molding pressure is 0.3 MPa, the injection time is 20 seconds, and the pressure holding time is 10 seconds.

[0028] The crystal selector 4 is a spiral crystal selector, and the height of the crystal section 4-1 part is 20mm, and the diameter is 15mm; the crystal selection section 4-2 is spiral, and its diameter is 3mm; the thickness of the transition section 4-3 is 3mm;

[0029] The cross-sectional shape of the seeding bar 5 is a rectangle, the side length of the rectangle is 5×3 mm, and the length of the seeding bar 5 is 20 mm;

[0030] The cross-section of the process auxiliary part 6 is a rectangle, and the side length of the rectangle is 6×4mm; the length of the process auxiliary part 6 is 20mm;

[0031] The single crystal casting 7 mold shell is prepared by alumina coating and alumina shell material; the mold shell is dewaxed by steam dewaxing,...

Embodiment 3

[0033] The process is the same as in Example 1, except that the cross-sectional shape of the process auxiliary part 6 is circular, and the diameter of the circle is 2 mm; the length of the process auxiliary part 6 is 15 mm;

[0034] Standard heat treatment is carried out after the single crystal casting 7 is prepared, and then the process auxiliary part 6 is cut off, and finally a complete single crystal casting without recrystallization is obtained.

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Abstract

The invention aims to provide a technological method for eliminating recrystallization of a single-crystal high-temperature alloy casting. The technological method aims to meet requirements of actualsingle-crystal casting production. According to the technological method, the single-crystal casting is manufactured with a directional solidification method; before casting, a technological auxiliaryportion connected with the single-crystal casting is introduced, the technological auxiliary portion and the casting form a new casting component, the technological auxiliary portion is the part of the lowest structural strength of the casting, and the technological auxiliary portion is the casting stress relief portion; the technological auxiliary portion is cut off after heat treatment of the casting, and then the complete single-crystal casting free of recrystallization is obtained.

Description

technical field [0001] The invention belongs to the technical field of high-temperature alloys, and particularly provides a process method for eliminating recrystallization of single-crystal high-temperature alloy castings. Background technique [0002] As the requirements for aeroengine turbine blades become more and more stringent, currently, the most advanced aero turbine blades used worldwide are nickel-based superalloy single crystal blades. The single crystal directional solidification technology was established and perfected in the development of superalloys. This technology was initially used to eliminate the transverse grain boundaries generated during the crystallization process, thereby improving the unidirectional mechanical properties of the material. However, in the actual solidification process, strain-induced recrystallization occurs due to casting stress, which in turn produces transverse grain boundaries, thereby impairing its high-temperature creep propert...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D17/00B22D27/04
CPCB22D17/00B22D27/045
Inventor 姜卫国肖久寒王莉张功楼琅洪张健
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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